Display a code page within the Quickbase interface

I have a Projects table, with a button in the form which opens in a new tab a single page application contained in a code page.
The link looks like this:

https://realm.quickbase.com/db/abcdefgh?pageID=17&projectId=81902&a=dbpage

The &a=dbpage was added so that the code page loads wrapped by the Quickbase applicaton interface (with the tables in the left navigation and the header at the top).

Recently I noticed that this doesn't work any longer and the page opens in a blank page. Is there a way to fix this?